package foo;

public class JavaClass_1 {
  private class PrivateJavaClass {}
  protected class ProtectedJavaClass {}
  public class PublicJavaClass {}
}

=====

import scala.reflect.runtime.universe._

package object foo {
  def testAll(): Unit = {
    test(typeOf[foo.JavaClass_1].typeSymbol)
  }

  def test(sym: Symbol): Unit = {
    printSymbolDetails(sym)
    if (sym.isClass || sym.isModule) {
      sym.typeSignature.declarations.toList.sortBy(_.name.toString) foreach test
    }
  }

  def printSymbolDetails(sym: Symbol): Unit = {
    def stableSignature(sym: Symbol) = sym.typeSignature match {
      case ClassInfoType(_, _, _) => "ClassInfoType(...)"
      case tpe => tpe.toString
    }
    println("============")
    println(s"sym = $sym, signature = ${stableSignature(sym)}, owner = ${sym.owner}")
    println(s"isPrivate = ${sym.isPrivate}")
    println(s"isProtected = ${sym.isProtected}")
    println(s"isPublic = ${sym.isPublic}")
    println(s"privateWithin = ${sym.privateWithin}")
  }
}

object Test extends App {
  foo.testAll()
}

============
sym = class JavaClass_1, signature = ClassInfoType(...), owner = package foo
isPrivate = false
isProtected = false
isPublic = true
privateWithin = <none>
============
sym = class $PrivateJavaClass, signature = ClassInfoType(...), owner = class JavaClass_1
isPrivate = true
isProtected = false
isPublic = false
privateWithin = <none>
============
sym = value this$0, signature = foo.JavaClass_1, owner = class $PrivateJavaClass
isPrivate = false
isProtected = false
isPublic = false
privateWithin = package foo
============
sym = object $PrivateJavaClass, signature = JavaClass_1.this.$PrivateJavaClass.type, owner = class JavaClass_1
isPrivate = true
isProtected = false
isPublic = false
privateWithin = <none>
============
sym = class $ProtectedJavaClass, signature = ClassInfoType(...), owner = class JavaClass_1
isPrivate = false
isProtected = true
isPublic = false
privateWithin = package foo
============
sym = value this$0, signature = foo.JavaClass_1, owner = class $ProtectedJavaClass
isPrivate = false
isProtected = false
isPublic = false
privateWithin = package foo
============
sym = object $ProtectedJavaClass, signature = JavaClass_1.this.$ProtectedJavaClass.type, owner = class JavaClass_1
isPrivate = false
isProtected = false
isPublic = false
privateWithin = package foo
============
sym = class $PublicJavaClass, signature = ClassInfoType(...), owner = class JavaClass_1
isPrivate = false
isProtected = false
isPublic = true
privateWithin = <none>
============
sym = constructor $PublicJavaClass, signature = (x$1: foo.JavaClass_1)JavaClass_1.this.$PublicJavaClass, owner = class $PublicJavaClass
isPrivate = false
isProtected = false
isPublic = true
privateWithin = <none>
============
sym = value this$0, signature = foo.JavaClass_1, owner = class $PublicJavaClass
isPrivate = false
isProtected = false
isPublic = false
privateWithin = package foo
============
sym = object $PublicJavaClass, signature = JavaClass_1.this.$PublicJavaClass.type, owner = class JavaClass_1
isPrivate = false
isProtected = false
isPublic = true
privateWithin = <none>
============
sym = constructor JavaClass_1, signature = ()foo.JavaClass_1, owner = class JavaClass_1
isPrivate = false
isProtected = false
isPublic = true
privateWithin = <none>